Power-to-weight ratio (specific power) is a calculation commonly applied to engines and other mobile power plants to enable the comparison of one unit or design to another. Power-to-weight ratio is a measurement of actual performance of any engine or power plant
examples:
kg/kW
lb/hp
1.000kg/kW = 1.644lb/hp
a 0.608 conversion ratio lb/hp to kg/kW
a 1.644 conversion ratio kg/kW to lb/hp
mars